Abstract:The methods to enhance the resilience of urban drainage system are summarized and explored. The focus is on the reconstruction of the drainage capacity of underpass tunnels. It is proposed to improve the resilience of urban drainage system through the combination of smart water management and underpass tunnel so as to meet the challenges in urban drainage planning and disaster management. The impact of smart water management and reconstruction of drainage capacity of underpass tunnel on the resilience of urban drainage systems is analyzed through the comprehensive research methods and implementation schemes. Taking Chengdu as an example, the data is collected and analyzed, and the results are evaluated. The research results provide the useful suggestions for the planning and practice of future urban drainage system.